19/06/2026
A generic company had a standard crossover design ready for a BA/BE study. The design needed to change before anyone enrolled.
The compound was a modified-release formulation. Standard crossover parameters are built for immediate-release drugs. Washout periods, PK sampling schedules. For modified-release, the drug absorbs and clears differently. A template designed for immediate-release applied here won't produce PK data that reliably supports a bioequivalence conclusion.
Caught during protocol review, before first patient. The crossover stayed. Washout extended, sampling schedule rebuilt, eligibility criteria adjusted.
Cost before enrollment: one week of protocol revision. Cost mid-study: a full amendment, delayed database lock, and a potential FDA query at submission.
BA/BE studies look routine until the formulation isn't.
What FDA BE study requirements look like in practice, including where formulation-specific design changes the outcome: https://credevo.com/articles/2025/06/15/ba-be-study-requirements-for-fda-approval-guidelines-global-locations-costs-quality-standards/
If you want a design review before protocol finalisation, we're here: https://credevo.com/contact